EP0629510B1 - Elément récepteur d'image pour le transfert thermique par diffusion de colorant - Google Patents

Elément récepteur d'image pour le transfert thermique par diffusion de colorant Download PDF

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Publication number
EP0629510B1
EP0629510B1 EP19940201604 EP94201604A EP0629510B1 EP 0629510 B1 EP0629510 B1 EP 0629510B1 EP 19940201604 EP19940201604 EP 19940201604 EP 94201604 A EP94201604 A EP 94201604A EP 0629510 B1 EP0629510 B1 EP 0629510B1
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Prior art keywords
dye
image receiving
layer
vinylchloride
support
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EP19940201604
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German (de)
English (en)
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EP0629510A1 (fr
Inventor
Emiel Verdonck
Wilhelmus Janssens
Geert Defieuw
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Agfa Gevaert NV
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Agfa Gevaert NV
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B41M5/529—Macromolecular coatings characterised by the use of fluorine- or silicon-containing organic compounds

Definitions

  • the present invention relates to receiving elements for use according to thermal dye sublimation transfer.
  • Thermal dye transfer methods include thermal dye sublimation transfer also called thermal dye diffusion transfer. This is a recording method in which a dye-donor element provided with a dye layer containing sublimating dyes having heat transferability is brought into contact with a receiver sheet and selectively, in accordance with a pattern information signal, heated with a thermal printing head provided with a plurality of juxtaposed heat-generating resistors, whereby dye is transferred from the selectively heated regions of the dye-donor element to the receiver sheet and forms a pattern thereon, the shape and density of which is in accordance with the pattern and intensity of heat applied to the dye-donor element.
  • the dye-image receiving element for use according to dye sublimation transfer usually comprises a support, e.g. paper or a transparent film, coated with a dye-image receiving layer, into which the dye can diffuse more readily.
  • An adhesive layer may be provided between the support and the receiving layer.
  • Means for improving the releasability of the receiving element from the donor element after transfer is effected are normally provided in the very receiving layer or on the top of it, a separate release layer may be coated.
  • thermoplastic vinylcopolymers having glass transition temperatures in the range of 50°C to 100°C such as copolymers of vinylchloride and vinylacetate, aromatic polyesters and styrene-acrylonitrile acrylates.
  • Receiving elements for use in thermal dye diffusion transfer have been described in e.g. EP 133012, EP 394460, US 4.985.397, EP 543441 and WO 93/07002.
  • the dye layer of a dye donor element can be a monochrome dye layer or it may comprise sequential repeating areas of different coloured dyes like e.g. of cyan, magenta, yellow or optionally black hue.
  • a dye-donor element containing three or more primary colour dyes is used, a multicolour image can be obtained by sequentially performing the dye transfer process steps for each colour.
  • thermal dye sublimation transfer printing is the production of hard copies of medical diagnostic images. Although such a hard copy can be produced on a reflective support such as paper, in most applications hard copies are produced on transparencies. These hard copies can be monochrome, in particular monochrome black, or multicoloured.
  • the requirements for medical diagnostic images are very stringent e.g. it is required that the images have a high light stability, optical densities above 2 are required, besides a high degree of consistency of the obtained optical densities, when ageing the material on the shelf, and low sensitivity to finger prints.
  • US 4.985.397 discloses an image receiving layer containing as the principal constituents a polyvinylchloride having active hydrogens and an isocyanate. Although high optical densities and sufficient light stability can be reached with such receiving layers, ageing tests of the image receiving material have shown that the reproducibility of the obtained optical densities is poor.
  • EP-A-503439 discloses a polyurethane based image-receiving layer obtained by reaction curing of e.g. a polyvinylchloride containing active hydrogens and a polyisocyanate, e.g. an aliphatic polyisocyanate.
  • the image receiving layer may further comprise a silicone releasing agent.
  • EP 440 227 discloses an image receiving material having on a support an image receiving layer containing a thermosetting composition of a polyvinylchloride resin having an active hydrogen, a silicon resin, a silicone oil that may have an active hydrogen and an aliphatic diisocyanate. Dye images obtained on such material are however susceptible of density changes when the material is aged for some time.
  • an image receiving material containing on a support an image receiving layer having as a principal component the hardened product of (i) a vinylchloride-based resin containing active hydrogens, (ii) an aliphatic polyisocyanate according to formula (I) and (iii) a polydialkylsiloxane containing active hydrogens.
  • a method for obtaining images using an image receiving material as defined above in conjunction with a dye donor element comprising on a support a dye layer containing one or more thermally transferable dyes in a thermal dye transfer recording process.
  • the obtained images are suitable for the purpose of medical diagnostics.
  • Aliphatic polyisocyanates for use in connection with the present invention correspond to the following formula (I): wherein n represents an integer from 2 to 12.
  • Examples of a vinylchloride-based resin containing active hydrogens for use in the present invention include vinylchloride-vinylacetate copolymers that are at least partially hydrolysed or copolymers of vinylchloride, vinylacetate and a hydroxyalkylacrylate.
  • Suitable polydialkylsiloxanes having active hydrogens for use in connection with the present invention are e.g. amino or hydroxy modified polydialkylsiloxanes such as e.g. a hydroxy-modified polydimethylsiloxane.
  • catalysts are added to the coating solution for the image receiving layer.
  • Suitable catalyst are e.g. organometallic compounds, e.g. compounds based on dibutyltin or dioctyltin e.g. dibutyltindilaurate or dioctyltindilaurate, or other organometallic compounds which include stannous octanoate, lead octanoate, zinc octanoate and cobalt naphtenate.
  • vinyl chloride-based resin and polydialkylsiloxane both containing active hydrogen and an isocyanate compound according to formula (I) be employed in such an amount ratio that the molar ratio of the NCO groups in the isocyanate compound to the active hydrogen containing groups is 0.2 to 2.
  • the polydialkylsiloxane having active hydrogens which can be hardened together with the vinylchloride based resin having active hydrogens by means of an isocyanate compound according to formula (I), is preferably incorporated in a ratio of 10 wt % or less of the total weight of the vinyl chloride-based resin containing active hydrogens.
  • a white pigment can be added to the receiving layer.
  • white pigment titanium oxide, zinc oxide, kaolin, clay, calcium carbonate, fine powdery silica, etc. can be employed, and these can be used as a mixture of two or more kinds as described above.
  • one or two or more kinds of additives such as UV-ray absorbers, light stabilizers and antioxidants, can be added, if necessary.
  • the amounts of these UV-ray absorbers and light stabilizers is preferably 0.05 to 10 parts by weight and 0.5 to 3 parts by weight, respectively, per 100 parts of the resin constituting the receiving layer.
  • the support for the receiver sheet it is possible to use a transparent film or sheet of various plastics such as polyethylene terephthalate, polyolefin, polyvinyl chloride, polystyrene, polycarbonate, polyether sulfone, polyimide, cellulose ester or polyvinyl alcohol-co-acetal. Blue-colored polyethylene terephthalate film can also be used.
  • the support may also be a reflective support such as paper e.g. top quality paper, art paper, cellulose fiber paper; baryta-coated paper; polyolefin-coated paper e.g. dual polyethylene-coated paper; synthetic paper e.g. polyolefin type, polystyrene type or white polyester type i.e. white-pigmented polyester.
  • a laminated product by any desired combination of the above can be used.
  • Typical examples of the laminates include a laminate of cellulose fiber paper and synthetic paper and a laminate of cellulose fiber paper and a plastic film or sheet.
  • a plastic film can be used with synthetic paper instead of cellulose fiber paper.
  • a laminate of cellulose fiber paper, plastic film and synthetic paper can also be used.
  • the support sheet serves to support the dye receiving layer, and it is desirable that the support sheet has mechanical strength sufficient enough to handle the dye receiving sheet which is heated at the time of heat transfer recording. If the dye-receiving layer alone has the necessary mechanical strength, the support sheet may be omitted.
  • the dye-receiving layer of the present invention preferably has an overall thickness of from 0.5 to 50 ⁇ m, more preferably from 2.5 to 10 ⁇ m, when the dye-receiving layer is provided on a support sheet, or preferably from 3 to 120 ⁇ m, when it is self-supporting i.e. a support sheet is omitted.
  • the image receiving layer may be a single layer, or two or more such layers may be provided on the support.
  • receiving layers may be formed on both surfaces of the support.
  • receiving layers may be formed on both surfaces of the support.
  • the thickness of such a toplayer is preferably 0.01 to 5 ⁇ m, particularly 0.05 to 2 ⁇ m.
  • the image receiving element of the present invention may also have one or more intermediate layers between the support and the image receiving layer.
  • the intermediate layers may function as cushioning layers, porous layers or dye diffusion preventing layers, or may fulfill two or more of these functions, and they may also serve the purpose of an adhesive, depending on the particular application.
  • the material constituting the intermediate layer may include, for example, an urethane resin, an acrylic resin, an ethylenic resin, a butadiene rubber, or an epoxy resin.
  • the thickness of the intermediate layer is preferably from 1 to 20 ⁇ m.
  • Dye diffusion preventing layers are layers which prevent the dye from diffusing into the support (particularly if the support is polyethylene-coated paper).
  • the binders used to form these layers may be water soluble or organic solvent soluble, but the use of water soluble binders is preferred, and especially gelatin is most desirable.
  • Porous layers are layers which prevent the heat which is applied at the time of thermal transfer from diffusing from the image receiving layer to the support to ensure that the heat which has been applied is used efficiently.
  • Fine powders consisting of silica, clay, talc, diatomaceous earth, calcium carbonate, calcium sulfate, barium sulfate, aluminum silicate, synthetic zeolites, zinc oxide, lithophone, titanium oxide or alumina for example, can be included in the image receiving layers, cushioning layers, porous layers, diffusion preventing layers and adhesive layers, etc. constituting the thermal transfer image receiving element of the present invention.
  • the image receiving element of the present invention can have antistatic treatment applied to the front or back surface thereof.
  • antistatic treatment may be carried out by incorporating an antistatic agent in, for example, the image receiving layer which becomes the front surface or in an antistatic preventive layer applied to the image receiving surface.
  • a similar treatment can also be effected to the back surface.
  • the image receiving sheet can have a lubricating layer provided on the back surface of the sheet support.
  • the material for the lubricating layer may include methacrylate resins such as methyl methacrylate, etc. or corresponding acrylate resins, vinyl resins such as vinyl chloride-vinyl acetate copolymer.
  • the receiving element can have detection marks provided on one surface, preferably the back surface so that the receiving element can be accurately set at a desired position during transfer, whereby the image can be formed always at a correct desired position.
  • a dye-donor element for use according to thermal dye sublimation transfer in combination with the present receiving element usually comprises a very thin support e.g. a polyester support, one side of which is covered with a dye layer, which contains the printing dyes.
  • a dye layer which contains the printing dyes.
  • an adhesive or subbing layer is provided between the support and the dye layer.
  • a slipping layer that provides a lubricated surface against which the thermal printing head can pass without suffering abrasion.
  • An adhesive layer may be provided between the support and the slipping layer.
  • the dye layer can be a monochrome dye layer or it may comprise sequential repeating areas of different colored dyes like e.g. of cyan, magenta, yellow and optionally black hue.
  • a dye-donor element containing three or more primary color dyes is used, a multicolor image can be obtained by sequentially performing the dye transfer process steps for each color.
  • the dye layer of such a thermal dye sublimation transfer donor element is formed preferably by adding the dyes, the polymeric binder medium, and other optional components to a suitable solvent or solvent mixture, dissolving or dispersing the ingredients to form a coating composition that is applied to a support, which may have been provided first with an adhesive or subbing layer, and dried.
  • the dye layer thus formed has a thickness of about 0.2 to 5.0 ⁇ m, preferably 0.4 to 2.0 ⁇ m, and the ratio of dye to binder is between 9:1 and 1:3 by weight, preferably between, 3:1 and 1:2 by weight.
  • polymeric binder As polymeric binder the following can be used: cellulose derivatives, such as ethyl cellulose, hydroxyethyl cellulose, ethylhydroxy cellulose, ethylhydroxyethyl cellulose, hydroxypropyl cellulose, methyl cellulose, nitrocellulose, cellulose acetate formate, cellulose acetate hydrogen phthalate, cellulose acetate, cellulose acetate propionate, cellulose acetate butyrate, cellulose acetate pentanoate, cellulose acetate benzoate, cellulose triacetate; vinyl-type resins and derivatives, such as polyvinyl alcohol, polyvinyl acetate, polyvinyl butyral, copolyvinyl butyral-vinyl acetal-vinyl alcohol, polyvinyl pyrrolidone, polyvinyl acetoacetal, polyacrylamide; polymers and copolymers derived from acrylates and acrylate derivatives, such as polyacrylic acid, poly
  • Any dye can be used in such a dye layer provided it is easily transferable to the dye-image-receiving layer of the receiver sheet by the action of heat.
  • the coating layer may also contain other additives, such as curing agents, preservatives, organic or inorganic fine particles, dispersing agents, antistatic agents, defoaming agents, viscosity controlling agents, etc., these and other ingredients being described more fully in EP 133011, EP 133012, EP 111004 and EP 279467.
  • additives such as curing agents, preservatives, organic or inorganic fine particles, dispersing agents, antistatic agents, defoaming agents, viscosity controlling agents, etc.
  • any material can be used as the support for the dye-donor element provided it is dimensionally stable and capable of withstanding the temperatures involved, up to 400°C over a period of up to 20 msec, and is yet thin enough to transmit heat applied on one side through to the dye on the other side to effect transfer to the receiver sheet within such short periods, typically from 1 to 10 msec.
  • Such materials include polyesters such as polyethylene terephthalate, polyamides, polyacrylates, polycarbonates, cellulose esters, fluorinated polymers, polyethers, polyacetals, polyolefins, polyimides, glassine paper and condenser paper. Preference is given to a polyethylene terephthalate support. In general, the support has a thickness of 2 to 30 ⁇ m.
  • the support may also be coated with an adhesive or subbing layer, if desired.
  • the dye layer of the dye-donor element may be coated on the support or printed thereon by a printing technique such as a gravure process.
  • a dye-barrier layer comprising a hydrophilic polymer may also be employed in the dye-donor element between its support and the dye layer to improve the dye transfer densities by preventing wrong-way transfer of dye towards the support.
  • the dye barrier layer may contain any hydrophilic material which is useful for the intended purpose.
  • gelatin polyacryl amide, polyisopropyl acrylamide, butyl methacrylate grafted gelatin, ethyl methacrylate grafted gelatin, ethyl acrylate grafted gelatin, cellulose monoacetate, methyl cellulose, polyvinyl alcohol, polyethylene imine, polyacrylic acid, a mixture of polyvinyl alcohol and polyvinyl acetate, a mixture of polyvinyl alcohol and polyacrylic acid or a mixture of cellulose monoacetate and polyacrylic acid.
  • Suitable dye barrier layers have been described in e.g. EP 227091 and EP 228065.
  • hydrophilic polymers for example those described in EP 227091, also have an adequate adhesion to the support and the dye layer, thus eliminating the need for a separate adhesive or subbing layer.
  • These particular hydrophilic polymers used in a single layer in the donor element thus perform a dual function, hence are referred to as dye-barrier/subbing layers.
  • the reverse side of the dye-donor element can be coated with a slipping layer to prevent the sprinting head from sticking to the dye-donor element.
  • a slipping layer would comprise a lubricating material such as a surface active agent, a liquid lubricant, a solid lubricant or mixtures thereof, with or without a polymeric binder.
  • the surface active agents may be any agents known in the art such as carboxylates, sulfonates, phosphates, aliphatic amine salts, aliphatic quaternary ammonium salts, polyoxyethylene alkyl ethers, polyethylene glycol fatty acid esters, fluoroalkyl C 2 -C 20 aliphatic acids.
  • liquid lubricants include silicone oils, synthetic oils, saturated hydrocarbons and glycols.
  • solid lubricants include various higher alcohols such as stearyl alcohol, fatty acids and fatty acid esters.
  • Suitable slipping layers are described in e.g. EP 138483, EP 227090, US 4567113, US 4572860, US 4717711.
  • the slipping layer comprises as binder a polycarbonate derived from 1,1-bis-(hydroxyphenyl)-3,3,5-trimethylcyclohexane.
  • the dye layer of the dye-donor element may also contain a releasing agent that aids in separating the dye-donor element from the dye-receiving element after transfer.
  • the releasing agents can also be applied in a separate layer on at least part of the dye layer.
  • solid waxes fluorine- or phosphate-containing surfactants and silicone oils are used. Suitable releasing agents are described in e.g. EP 133012, JP 85/19138, EP 227092.
  • the dye-receiving elements according to the invention are used to form a dye transfer image.
  • a process comprises placing the dye layer of the donor element in face-to-face relation with the dye-receiving layer of the receiver sheet and imagewise heating from the back of the donor element.
  • the transfer of the dye is accomplished by heating for about several milliseconds at a temperature of 400°C.
  • a monochrome dye transfer image is obtained.
  • a multicolor image can be obtained by using a donor element containing three or more primary color dyes and sequentially performing the process steps described above for each color.
  • the above sandwich of donor element and receiver sheet is formed on three occasions during the time when heat is applied by the thermal printing head. After the first dye has been transferred, the elements are peeled apart.
  • a second dye-donor element (or another area of the donor element with a different dye area) is then brought in register with the dye-receiving element and the process repeated.
  • the third color and optionally further colors are obtained in the same manner.
  • detection marks are commonly provided on one surface of the donor element.
  • optically detectable marks are used that can be detected by a light source and a photo sensor; detection can be done by measuring the light transmitted through the detection mark or reflected from said mark.
  • the marks being in the form of a light-absorbing or light-reflecting coating are formed in a preassigned position on the donor element by e.g. gravure printing.
  • the detection marks can comprise an infrared absorbing compound such as carbon black.
  • the detection mark can also comprise one of the image dyes that are used for the image formation, with the detection being in the visible range.
  • thermal heads In addition to thermal heads, laser light, infrared flash or heated pens can be used as the heat source for supplying heat energy.
  • Thermal printing heads that can be used to transfer dye from the dye-donor element to the receiver sheet are commercially available.
  • the dye layer or another layer of the dye element has to contain a compound that absorbs the light emitted by the laser and converts it into heat, e.g. carbon black.
  • the support of the dye-donor element may be an electrically resistive ribbon consisting of, for example, a multi-layer structure of a carbon loaded polycarbonate coated with a thin aluminum film.
  • Current is injected into the resistive ribbon by electrically addresssing a print head electrode resulting in highly localized heating of the ribbon beneath the relevant electrode.
  • the fact that in this case the heat is generated directly in the resistive ribbon and that it is thus the ribbon that gets hot leads to an inherent advantage in printing speed using the resistive ribbon/electrode head technology compared to the thermal head technology where the various elements of the thermal head get hot and must cool down before the head can move to the next printing position.
  • Two receiving elements on a polyethylene terephthalate film support having a thickness of 175 ⁇ m with the following characteristics were used : both on a subbing layer containing after drying for 3 minutes at 120°C : 3,6 g/m 2 of poly(vinylchloride/covinylacetate/ covinylalcohol) (Vinylite VAGD supplied by Union Carbide), 0,150 g/m 2 Tegomer HSI 2110-dihydroxypolydimethylsiloxane, supplied by Th.Goldschmidt AG.
  • Vinylite VAGD supplied by Union Carbide
  • Tegomer HSI 2110-dihydroxypolydimethylsiloxane supplied by Th.Goldschmidt AG.
  • One of the receiving elements was hardened with an aromatic diisocyanate compound containing after drying 0,357 g/m 2 of I2 and 0,0143 g/m 2 of a zinc octanoate solution (Siccatol Zn 12 from Akzo) as a catalyst.
  • an aromatic diisocyanate compound containing after drying 0,357 g/m 2 of I2 and 0,0143 g/m 2 of a zinc octanoate solution (Siccatol Zn 12 from Akzo) as a catalyst.
  • the other was hardened with an aliphatic polyisocyanate compound containing after drying 1,16 g/m 2 of I1 and 0,046 g/m 2 of a zinc octanoate solution (Siccatol Zn 12 from Akzo) as a catalyst.
  • Dye-donor elements for use with the above described receiving elements according to thermal dye sublimation transfer were prepared as follows :
  • a dye layer having a wet thickness of 100 ⁇ m was coated from this solution on a polyethylene terephthalate film support having a thickness of 6 ⁇ m and carrying a conventional subbing layer.
  • the resulting dye layer was dried by evaporation of the solvent.
  • the opposite side of the film support was coated with a subbing layer of a copolyester comprising ethylene glycol, adipic acid, neopentyl glycol, therephthalic acid, isophthalic acid, and glycerol.
  • a copolyester comprising ethylene glycol, adipic acid, neopentyl glycol, therephthalic acid, isophthalic acid, and glycerol.
  • the dye-donor element was printed in combination with the above described receiver sheets in a Mitsubishi colour video printer CP100E.
  • the receiver sheet was separated from the dye-donor element and the colour density value of the recorded image was measured by means of a Macbeth TR 924 densitometer in the red, green, and blue regions in Status A mode.
  • each receiver sheet was subjected to irradiation by means of a xenon lamp of 150 klux for a time indicated in hours in Table 1 and the colour density values were measured again. The density change was calculated and is listed in percent in Table 1.
  • Table 1 shows that the light stabilities of the dyes, belonging to various structural classes, transferred on the receiver with the aliphatic isocyanate hardening agent are superior to those obtained on the receiver with the aromatic isocyanate hardening agent.
  • Table 1 Dye Nr % Dye by weight used Density change in % after xenon exposure for Desmodur VL aromatic Desmodur N3300 aliphatic 4h 12h 28h 4h 12h 28h 1 0.3 -4 -13 -64 0 -5 -7 2 0.3 -3 -11 -39 -1 -3 -10 3 0.3 -3 -10 -18 -3 -6 -6 4 0.2 -14 -44 -79 -14 -28 -46 5 0.2 -15 -47 -74 -14 -24 -48 6 0.3 -13 -61 -98 -8 -16 -35 7 0.5 0 -9 -41 -2 -6 -22 8 0.3 -13 -31 -85 -8 -25 -79 9 0.5
  • Two receiving elements on a polyethylene terephthalate film support having a thickness of 175 ⁇ and two receiving elements on a white opaque polyethylene terephthalate film support having a thickness of 175 ⁇ have been prepared according to the following composition.
  • the four receiving elements were used as in example 1 in combination with a tri-coloured yellow, magenta, cyan gravure printed dye-donor element as described hereinafter.
  • the transfer process has been repeated three times, once with freshly coated receiving elements, once after storing it for 6 days at 57°C/34 % RH and once after storing it for 12 days at 57°C/34 % RH.
  • the maximum colour densities are obtained from a three colour donor element made by gravure printing on a Diafoil K200 6 ⁇ m of the following printing inks.
  • the structure formulas of the colour dyes are given in Table 4.
  • Two receiving elements on a polyethylene terephthalate film support having a thickness of 175 ⁇ have been prepared according to the following composition.

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  • Thermal Transfer Or Thermal Recording In General (AREA)

Claims (7)

  1. Un matériau récepteur d'image contenant sur un support une couche réceptrice d'image possédant comme composant principal le produit durci de (i) une résine sur base de chlorure de vinyle contenant des hydrogènes actifs, (ii) un polyisocyanate aliphatique selon la formule (I) et (iii) un polydialkylsiloxane contenant des hydrogènes actifs:
    Figure imgb0014
     dans laquelle n représente un nombre entier de 2 à 12.
  2. Un matériau récepteur d'image selon la revendication 1, caractérisé en ce que la résine sur base de chlorure de vinyle est un poly(chlorure de vinyle-co-acétate de vinyle) hydrolysé.
  3. Un matériau récepteur d'image selon la revendication 1 ou 2, caractérisé en ce que le polydialkylsiloxane contenant des hydrogènes actifs est un polydiméthylsiloxane modifié par un groupe hydroxy.
  4. Un procédé pour faire un matériau récepteur d'image, lequel procédé comprend les étapes suivantes:
    - couler sur un support une solution contenant:
    un solvant organique;
    une résine sur base de chlorure de vinyle contenant des hydrogènes actifs;
    un polyisocyanate aliphatique selon la formule (I):
    Figure imgb0015
        dans laquelle n représente un nombre entier de 2 à 12;
    un polydialkylsiloxane contenant des hydrogènes actifs;
    un catalyseur pour un durcissement à l'isocyanate;
    - permettre a cette couche de sécher et de durcir à un degré de conversion d'au moins 50 %.
  5. Un procédé selon la revendication 4, caractérisé en ce que cette résine sur base de chlorure de vinyle est un poly(chlorure de vinyle-co-acétate de vinyle) hydrolysé.
  6. Un procédé selon la revendication 4 ou 5, caractérisé en ce que le polydialkylsiloxane contenant des hydrogènes actifs est un polydiméthylsiloxane modifié par un groupe hydroxy.
  7. Un procédé pour faire une image selon la méthode de transfert par thermosublimation, lequel procédé comprend les étapes suivantes:
    - mettre une couche de colorant contenant un ou plusieurs colorants transférables thermiquement d'un élément donneur de colorant en contact face à face avec la couche réceptrice d'image d'un élément récepteur d'image tel que défini dans l'une quelconque des revendication 1 à 3.
    - échauffer sous forme d'image un assemblage ainsi obtenu à partir du dos de l'élément donneur de colorant et
    - séparer cet élément donneur de colorant de l'élément récepteur d'image.
EP19940201604 1993-06-21 1994-06-06 Elément récepteur d'image pour le transfert thermique par diffusion de colorant Expired - Lifetime EP0629510B1 (fr)

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EP93201778 1993-06-21
EP19940201604 EP0629510B1 (fr) 1993-06-21 1994-06-06 Elément récepteur d'image pour le transfert thermique par diffusion de colorant

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EP0629510B1 true EP0629510B1 (fr) 1997-09-10

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